Paper Info
Title
The role of cardiopulmonary signals in the dynamics of the eye's wavefront aberrations.
Abstract
The role of cardiopulmonary signals in the dynamics of wavefront aberrations in the eye has been examined. Synchronous measurement of the eye's wavefront aberrations, cardiac function, blood pulse, and respiration signals were taken for a group of young, healthy subjects. Two focusing stimuli, three breathing patterns, as well as natural and cycloplegic eye conditions were examined. A set of tools, including time-frequency coherence and its metrics, has been proposed to acquire a detailed picture of the interactions of the cardiopulmonary system with the eye's wavefront aberrations. The results showed that the coherence of the blood pulse and its harmonics with the eye's aberrations was, on average, weak ( 0.4+/-0.15), while the coherence of the respiration signal with eye's aberrations was, on average, moderate ( 0.53+/-0.14). It was also revealed that there were significant intervals during which high coherence occurred. On average, the coherence was high ( > 0.75) during 16% of the recorded time, for the blood pulse, and 34% of the time for the respiration signal. A statistically significant decrease in average coherence was noted for the eye's aberrations with respiration in the case of fast controlled breathing (0.5 Hz). The coherence between the blood pulse and the defocus was significantly larger for the far target than for the near target condition. After cycloplegia, the coherence of defocus with the blood pulse significantly decreased, while this was not the case for the other aberrations. There was also a noticeable, but not statistically significant, increase in the coherence of the comatic term and respiration in that case. By using nonstationary measures of signal coherence, a more detailed picture of interactions between the cardiopulmonary signals and eye's wavefront aberrations has emerged.
Year
DOI
Venue
2010
10.1109/TBME.2009.2032531
IEEE Trans. Biomed. Engineering
Keywords
Field
DocType
eye,cycloplegia,cardiology,respiration signals,time-varying coherence,pulse and respiration,wavefront sensing,time-frequency coherence,focusing stimuli,pneumodynamics,eye wavefront aberrations,medical signal processing,comatic term,blood pulse,cardiopulmonary signals,cardiac function,cycloplegic eye,breathing patterns,biomedical signal processing,vision defects,synchronous measurement,defocus coherence,fluctuations,statistical significance,time frequency,coherence
Eye disease,Wavefront,Pulse (signal processing),Electronic engineering,Artificial intelligence,Heart rate,Medicine,Computer vision,Cycloplegia,Respiration,Optics,Coherence (physics),Breathing
Journal
Volume
Issue
ISSN
57
2
1558-2531
Citations 
PageRank 
References 
0
0.34
8
Authors
3
Name
Order
Citations
PageRank
Michael Muma114419.51
D. Robert Iskander210423.65
Michael J. Collins316324.59